Ferrofluid and Solenoids

[swifters]

Hi all, does anyone have any knowledge on ferrofluids here? Is it more of a chemistry question? Anyway saw this article in the new scientist magazine regards ferrofluid for central heating. It seemed like a reasonable idea and wondered if anyone on here could see why it may not be viable.

 

http://books.google....heating&f=false

 

Secondly, does anyone have a fairly basic formula/calculator for predicting energy consumption of solenoids.

 

Many thanks

Edited September 20, 2012 by swifters

[swifters]

guess thats a no then?